[wp-trac] [WordPress Trac] #32197: Twemoji script and editor expansion combo making editor ridiculously slow in some circumstances

[WordPress Trac]

#32197: Twemoji script and editor expansion combo making editor ridiculously slow
in some circumstances
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 Reporter:  Otto42        |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.3
Component:  TinyMCE       |     Version:  4.1
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by azaozz):

 @Otto42 right, a straightforward fix would be to add an "exclude" class to
 that div and then check for it when before calling `test()` or `parse()`
 from the mutation observer. A better fix would be if we can find a better
 way to resize the textarea :)

 @rowd1951 also suspecting this depends on the Twemoji's test regex. It is
 very long: https://github.com/twitter/twemoji/blob/gh-
 pages/twemoji.js#L236

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Ticket URL: <https://core.trac.wordpress.org/ticket/32197#comment:10>
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